| Read the following and answer the questions from [11] to [15]. |
| A body is said to have a uniform motion, if it travels equal distances in equal intervals of time, no matter how small these intervals may be. The distance travelled by an object in uniform motion increases linearly. |
| A train travels from one station to the next. The driver of train A starts from rest at time t = 0 and accelerates uniformly for the first 20 s. At time t = 20 s, train reaches its top speed of 25 m/s, then travels at this speed for further 30 s before decelerating uniformly to rest. Total time for the journey of train A is 60 s. |
| Another train B is travelling in the parallel of train A with zero initial speed at t = 0 and then accelerates uniformly for first 10 s. |
| At time t = 10 s it reaches its top speed of 30 m/s, then travels at this speed for further 20 s before decelerating uniformly to rest Total time for the journey of train B is 80 s. |
A)
B)
C)
D)
Correct Answer: B
Solution :
| [b] Speed-time graph for the motion of train -A |
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